wppaste
WordPress

delete_site_meta_by_key( string $meta_key ): bool

Since
5.1.0
Source
wp-includes/ms-site.php:1122
Deletes everything from site meta matching meta key.

Compatibility

WordPress
since 5.1.0
PHP
7.4–8.6-dev
  • 6.7.7
  • 6.8.8
  • 6.9.7
  • 7.0.4
  • 7.1.0

Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.

Parameters

$meta_keystring
Metadata key to search for when deleting.

Return value

bool
Whether the site meta key was deleted from the database.

Performance profile

How much work a call to delete_site_meta_by_key() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.

Cost class
Light

Only touches the object cache, via wp_cache_delete_multiple().

Scaling
Constant

No loop in the body: the same number of instructions runs whatever you pass in.

Instructions
9

Executed per call on PHP 8.5. The body compiles to 9.

Plugin surface
None

Nothing here hands control to plugin code.

Called by
0

Nothing in core calls this; the cost is only what you spend yourself.

What it touches

  • hookthird-party callbacksapply_filters()one call below delete_site_meta_by_key()
  • serializeserialisationmaybe_serialize()one call below delete_site_meta_by_key()
  • cacheobject cachewp_cache_delete_multiple()one call below delete_site_meta_by_key()

What one call costs · 1 distinct outcome

One number would be a lie: the work depends on which branch runs. These are every distinct cost delete_site_meta_by_key() can have, taken from its control-flow graph on PHP 8.5.

WhenInstructionsCalls it makes
always9delete_metadata()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 9 instructions, 9 executed per call, 0 branches. The work does not change between versions.

An instruction is not a fixed amount of time, so a matching count is not necessarily the same speed; what it rules out is a difference in the work itself.

Uses · 1

Source code

View on Trac View on GitHub 

function delete_site_meta_by_key( $meta_key ) {	return delete_metadata( 'blog', null, $meta_key, '', true );}

Changelog

Introduced in 5.1.0. Unchanged from 6.7.7 through 7.1.0.

  1. 6.7.7
  2. 6.8.8
  3. 6.9.7
  4. 7.0.4
  5. 7.1.0

Signature, return type and hooks compared across 5 parsed releases.

About this page

Parsed data
Generated from the wordpress-develop 6.8.8 tag, from src/wp-includes/ms-site.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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